NAOSITE: Nagasaki University's Academic Output SITE
Title
On a New Variety of Aegagropila Sauteri Found in Lake Yamanaka
Author(s)
Okada, Yoshikazu
Citation
長崎大学水産学部研究報告, v.5, pp.30-33; 1957
Issue Date
1957-02-28
URL
http://hdl.handle.net/10069/31942
Right
This document is downloaded at: 2015-01-30T17:46:24Z
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On a New Variety
Found
of Aegagropila
in Lake
Yoshikazu
Sauteri
Yamanaka
OKADA
o
u
rs
p
e
c
i
e
so
f Aegagrotila have s
of
a
r been reported from
I
n Japan，f
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n Hokkaido and t
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31
：and grows in the deeper places than that of the ball−shaped ones where the
current of the springs has no influence．
The ball−shaped type appears green colored， and the diamete’r is measur−
ed 13 cm．， 5cm． in maximum， and usually one pebble， rarely two， enclosed
欝繕
in the center of the frond； and this ball−shaped frond is soft， consisting of
radiating and loosely interwined branched filaments．
襲一
懸
灘
醗
“藁沸写
P樗
瀞雑乃
華凌
鞭 灘
灘
Fig． 2． AegagroPila Sauteri （NEEs） KuTz． var・ ptamanakaensis OKADA．
（ball−shaped fronds）
As far as 1 know， this species of AegagroPila， described as follows， has
rnany characteristics which have not been found in other known species of
the genus， and the writer named and described it as a new variety of
Aegagropila Sauteri （NESS） KOTZ・ to commemorate the first locality where
it was discovered．
Recently， the second locality has been discovered in Lake Kawaguchi，
which also lieS at the foot of Mt． Fuji， near Lake Yamanaka， as one of the
so−called “Five Lakes of Mt． Fuji”， but no precise report has been heard
of before the writer wrote this report．
Aega．．ropila Sauteri （NEES） KVTz． var． ya：nanakaensig OKADA var． nov．
Planta laetevirens， pulchra， sphaerica vel paullo irregularis； frondibus
rninoribus， ellipsoideis vel fusiformibus， 1−3 cm． diam． （maximis usqua ad
5 cm．）， in centro nidulantibus lapillum O．5−2 mm． diam．， densissime radiatim
ramosis， mollibus； cellulae rami cylindricae， 60−80 IL diam．， 5−9−plo longiores
quam latae； cellulae laterales elongato−cylinericae 50−70 pa diam．， 6−10−plo
loagiores quam latae； cellulae ramuli inferiores oppositi vel alterni， super−
jores secundi， sub angulo 200−300 egressae ； ramis rhizoideis paucissimis．
JaPanese name： Fuji−marimo （n． n．）
32
Local吻：：Lake Yamanaka， Minami−tsuru−gun， Yamanashi Prefecture．
（Discovered by T． SuGluRA， April 6， 1956； TYpe・in Herb． Yoshikazu OKA−
DA， no． c！56−1．， Collected ．by．Yoshikazu OKADA， Sept． 9，一・1956）
Habitat： Growing at a depth of， about一 1一一一一5 ．meters， lying on the sandy
bottom of the lake．
Distribution： Endemic．
Remarks： The above−mentioned variety is
most closely related to AegagroPila Sauteri
（NESS） KUTz． from Lake Akan in Hokkaid6
へ
in the shape and measuremeht of the cell，
and also the angles’ 盾?@branching but it dif−
fers from the ・latter・ this variety is not so
s
覇
rigid but flexible and enclosing the pebble
in the center of the ball−shaped frond．
N［Nl ・」・
And， moreover， the ball−shaped frond of
this variety the maximum’一size i’s not so large
ごead ce1ユ．
rh！zo；d
一−L鰍
1
Fig・ 3・ Upper patt of a filament
of Ae． Sauteri （NEEs） KuTz． var・
yamanakaensis OKADA． showing
the branching mode） cells and
a rhizoid．
as that of AgeagroPila Sauteri （NESS） KVTz．
33
今← 憩 今←
Key to the species of Ae ga gropila hitherto be known from Japan and its
surrounding areas． ・ 、．1・．・
Frond ba11。shaped・…・・……………・……………………・・…………………………2
・｛F・・n⑳・t ball一・ha面∴」……轟論df鑑濫耀臨
Cells cylindrical………．．・……．．・＿…．＿．．＿…＿………… ………………・・… …・3
2｛C。11，n。t。ylind。i、a1…．．……………∵＿……………．．……＿，……．1…．……4
13轄：：1灘鱒1鑓耀欝糠
ら
Frond compact…・・…・…・・・・………………・…・…………・…・・………………・・……・5・
4｛F，。ndh。11。wゑd．．…．．…∴…．一＿．．一．…．………．．…．L…∴．………．．」……．6
Cells davate……………………・………・・…Ae。 minima（OKADA）0：KADA幹．
（Sakyδ一numa in N． Honshfi）
5
Cells swollen……………・・…・………………………………Ae． Kannoi TOK DA
（：Lake Tδba in S． Saghalien）
Frond with pebble・・…・………・・…・…・……．…・・………Ae． Km ilensis NAGA1．
（Naebo・numa in S． KUriles）
6
Frond without pebble…………………Ae． S3uteri Borgeanq．NORDSTEDT
（Chimikeppu i．n且okkaid6）
ee This species was previously described under the name a’s fOllows， but emended
here as an independent species because of the specific characters were clear−
ed afterwards．
syn． AegagroPila Sauteri （NEEs） KuTz・ var． ninima OKADA． in Bull・ ’Ndt Sc． Mus． 32，
99−103 （1953） ・
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